Retirement tax questions

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@ColeenD3 wrote:

She has a pension, not an IRA. Yes, pensions must distribute RMDs and she must take her RMD if she has reached age 72.

In TurboTax Deluxe (on my PC), in the help for the RMD it says

"The amount depends on your life expectancy and and the balance in the account"

But there is no "balance" for a pension, right?  It just pays indefinitely.  So how do you calculate the RMD for a pension with no balance?